Novatel OM-20000122 user manual Mount the Antenna, Mount the SPAN-CPT

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SPAN-CPT Installation

Chapter 2

2.2.1Mount the Antenna

For maximum positioning precision and accuracy, as well as to minimize the risk of damage, ensure the antenna is securely mounted on a stable structure that will not sway or topple. Where possible, select a location with a clear view of the sky to the horizon so each satellite above the horizon can be tracked without obstruction. The location should also be one that minimizes the effect of multipath interference. Ensure the antenna cannot move due to dynamics.

For a discussion on multipath, refer to An Introduction to GNSS on the NovAtel website.

2.2.2Mount the SPAN-CPT

Mount the SPAN-CPT in a fixed location where the distance from the SPAN-CPT to the GNSS antenna phase center is constant. Ensure the SPAN-CPT orientation, with respect to the vehicle and antenna, is also constant.

For attitude output to be meaningful, the SPAN-CPT should be mounted so the positive Z-axis marked on the SPAN-CPT enclosure points up and the Y-axis points forward through the front of the vehicle, in the direction the vehicle is moving.

Figure 4: SPAN-CPT Enclosure Mounting

Z

Y

X

Also, it is important to measure the distance from the SPAN-CPT to the antenna (the Antenna Lever Arm), on the first usage, on the axis defined on the SPAN-CPT enclosure. See also Appendix A, Technical Specifications on page 48 for dimensional drawings of the SPAN-CPT.

Ensure the SPAN-CPT and GNSS antenna cannot move due to dynamics and that the distance and relative direction between them is fixed.

The closer the antenna is to the SPAN-CPT, the more accurate the position solution. Also, your measurements when using the SETIMUTOANTOFFSET command must be as accurate as possible or at least more accurate than the GNSS positions being used. For example, a 10 cm error in recording the antenna offset results in at least a 10 cm error in the output.

Millimeter accuracy is preferred.

The offset from the SPAN-CPT to the antenna and/or a user point device, must remain constant especially for RTK or DGNSS data. Ensure the SPAN-CPT, antenna and user point device are bolted in one position perhaps by using a custom bracket.

SPAN-CPT User Manual Rev 8

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Contents SPAN-CPT Return instructions Proprietary Notice WarrantyTable of Contents Technical Specifications Figures Tables Contact Information NovAtel Knowledge Base Before Contacting Customer SupportFCC Notices Industry CanadaCE Notice Hazard Impact Lightning Protection Installation and Grounding ProcedureWhat is the hazard? Weee NoticePrimary and Secondary Lightning Protection Ref # Description Fundamentals of GNSS+INS IntroductionSystem Components Related Documents and InformationConventions SPAN-CPT Hardware SPAN-CPT InstallationRequired Equipment ManualsTypical SPAN-CPT Set Up Radio COM2 Hardware Set UpMount the SPAN-CPT Mount the AntennaConnect the Gnss Antenna Connect PowerConnect the I/O Strobe Signals Battery Isolator Auxiliary Vehicle MainBatteryConnect a Computer to the SPAN-CPT Can Bus Odometer ConnectionOdometer Requirements Cable Modification for SPAN-CPT Cable Cable Modification for Kistler WPT CableSPAN-CPT Operation Definition of Reference Frames Within SpanLocal Level Frame Full Mapping Definitions Span Body FrameVehicle Frame Enclosure FrameUse NovAtel Connect to Communicate Communicating with the SPAN-CPT SystemChapter SPAN-CPT Operation SPAN-CPT Configuration with NovAtel Connect Software ConfigurationGnss Configuration Span IMU ConfigurationReal Time Operation Ascii System Start-Up and Alignment TechniquesSetimuorientation Default Kinematic AlignmentNavigation Mode Manual AlignmentDual Antenna Alignment Wheel Sensor Update Logic Azimuth Sources on a Span SystemCourse Over Ground Inertial Azimuth Align AzimuthLogs with Azimuth data Data Collection Solution ParametersData Collection for Post-Processing  Logging RestrictionVariable Lever Arm Enabling L-BandNovAtel Correct with TerraStar OmniSTAR Veripos Marine SubscriptionsChapter SPAN-CPT Operation SPAN-CPT Dual-Antenna InstallationSecondary Configuring Span with Align on SPAN-CPTPower Supply Chapter SPAN-CPT Dual-AntennaAlignment on a Moving Vessel Aided Transfer Alignment Alignment on a Stationary Vehicle Aided Static AlignmentUnaided Alignment Automatic Alignment Mode Automatic Alignment default Span Align Attitude UpdatesFirmware Updates and Model Upgrades Firmware UpdatesNovAtel Firmware and Software Model Upgrades Authorization CodeUpdating or Upgrading Using the WinLoad Utility Transferring Firmware FilesTypes of Firmware Files Open a File to Download Using the WinLoad UtilitySearching for Card Updating using SoftLoad CommandsSoftloadsrec S-RECORD Working with S-RecordsUpgrading Using the Auth Command Key Firmware CommandsUpgrade Procedure KVH IMU Sensor Specifications Technical SpecificationsSPAN-CPT Technical Specifications Hardware Specification for SPAN-CPTPower Specifications Electrical and Environmental SpecificationsSPAN-CPT Side and Perspective View SPAN-CPT Mechanical DrawingsSPAN-CPT Top, Front and Bottom View SPAN-CPT 60723108 KVH Development Terminated Cable Pin-Out SPAN-CPT CableFemale Male SPAN-CPT 60723107 KVH Standard Un-terminated Cable Pin-Out Pin Function Wire Pair Wire ColorReplacement Parts Accessories and OptionsSPAN-CPT System Appendix C Frequently Asked QuestionsOM-20000122 Rev March